INA203A BURR-BROWN [Burr-Brown Corporation], INA203A Datasheet - Page 15

• Manufacturer Part Number: INA203A
• Description: Unidirectional Measurement Current-Shunt Monitor with Dual Comparators
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

It is important to note what will happen if events
occur more rapidly than the delay timeout; for
example, when the U1 output goes high (turning on
I2), but returns low (turning I1 back on) prior to
reaching the 0.6V transition for U2. The voltage at
U2 +IN ramps back down at a rate determined by the
value of C
sufficient time.
In essence, when analyzing Comparator 2 for
behavior with events more rapid than its delay
setting, use the model shown in
COMPARATOR MAXIMUM INPUT VOLTAGE
RANGE
The maximum voltage at the comparator input for
normal operation is up to (V+) – 1.5V. There are
special
reference inputs (pins 3 and 6). Driving either or both
inputs high enough to drive 1mA back into the
reference introduces errors into the reference.
Figure 36
guideline is to limit the voltage on both inputs to a
total of 20V. The exact limit depends on the available
Current Shunt Monitor Output
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considerations
shows the basic input structure. A general
V < 11.2
DELAY
Figure 37. Overdriving Comparator Inputs Without Generating a Reference Error
, and only returns to zero if given
-18V to +80V
Load Supply
C
0.01 F
BYPASS
when
m
Figure
CMP1 IN /0.6 REF
overdriving
34.
CMP1 IN+
CMP2 IN+
CMP2 IN-
-
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GND
OUT
V
S
the
1.2V REF
INA203
x20
voltage and whether either or both inputs are subject
to
determination, consider the 20k
back to the comparator.
maximum input voltage that avoids creating a
reference error when driving both inputs (an
equivalent resistance back into the reference of
10k ).
Figure 36. Limit Current Into Reference
Transparent/Reset
V
V
1.2V REF OUT
CMP1 OUT
CMP2 OUT
CMP2 DELAY
CMP1
CMP1 IN-
CMP2 IN+
the
IN+
IN-
RESET
large
R
3mW
SHUNT
Latch
20kW
voltage.
Optional Delay
Capacitor
0.2 F
m
R
4.7kW
£ 1mA
20kW
PULL-UP
Figure 37
When
1.2V
R
4.7kW
PULL-UP
SBOS393 – MARCH 2007
from each input
making
shows the
INA203
INA204
INA205
Load
5V Supply
1mA
this
15